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Preparation method of high-strength flame-retardant galactomannan-based composite membrane

A galactomannan and composite membrane technology, which is applied in the field of biomass synthesis composite materials, can solve the problems of small improvement in mechanical properties and low mechanical strength of the galactomannan membrane, and achieves high mechanical strength and flame retardancy. Good, good usability effect

Inactive Publication Date: 2020-06-05
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the amorphous and branched structure of galactomannan, galactomannan films are hygroscopic and have low mechanical strength
Some researchers have proposed some strategies to improve the overall mechanical properties of galactomannan-based films, such as UV irradiation and adding cross-linking agents (glycerol, sorbitol, and polyethylene glycol), but these methods are not effective for galactomannan. The mechanical properties of mannan membranes are not improved much

Method used

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  • Preparation method of high-strength flame-retardant galactomannan-based composite membrane
  • Preparation method of high-strength flame-retardant galactomannan-based composite membrane
  • Preparation method of high-strength flame-retardant galactomannan-based composite membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: Preparation of galactomannan / bentonite composite film

[0033] (1) Soak the air-dried Cinnamon seeds in hot water for 6 hours, separate the endosperm of the Cinnabar seeds from the rest, dry the obtained endosperm at 30° C., grind it mechanically, and pass through a 100-mesh sieve to obtain the Cinnabis endosperm powder. Mix the endosperm powder and distilled water at a solid-to-liquid ratio of 1:50, put it in an extraction tank, stir and extract at 50°C for 24 hours, centrifuge the extract at 5000r / min for 10 minutes to obtain a supernatant, and add the supernatant under stirring 3 times the volume of ethanol with a concentration of 95% was centrifuged at 10,000 r / min for 10 minutes to obtain a precipitate. The precipitate was washed 5 times with 95% ethanol, and the washed precipitate was freeze-dried to obtain galactomannan. The purity and molecular weight of galactomannans were determined.

[0034] (2) Add 2 g of galactomannan (GM) into 100 mL of dis...

Embodiment 2

[0039] Embodiment 2: Preparation of galactomannan / bentonite / graphene oxide composite film

[0040] (1) Prepare a galactomannan (GM) solution according to step (2) of Example 1.

[0041] (2) Bentonite (BNT) suspension was prepared according to step (3) of Example 1.

[0042] (3) Add 1 g of graphene oxide into 100 mL of distilled water, stir and sonicate, repeat 5 times, and centrifuge at 10,000 r / min for 10 min to obtain a uniform graphene oxide (GO) dispersion.

[0043] (4) Mix the galactomannan solution of step (1) and the bentonite suspension of step (2) at a mass ratio of GM and BNT of 5:5, and add 0.4wt%, 0.8wt%, 1.6wt% , 2% wt% graphene oxide dispersion, stirred for 24h, the composite solution obtained was added to a plastic plate, evaporated to dryness, and obtained galactomannan / bentonite / graphene oxide composite film (GM / BNT / GO composite film ).

[0044] The results showed that in the infrared spectrum of GM / BNT / GO composite film ( figure 1 ), at 3430cm -1 The int...

Embodiment 3

[0046] Embodiment 3: Preparation of Galactomannan / Bentonite / Graphene Oxide / Borate Composite Film

[0047] (1) Prepare a galactomannan (GM) solution according to step (2) of Example 1.

[0048] (2) Bentonite (BNT) suspension was prepared according to step (3) of Example 1.

[0049] (3) Prepare a graphene oxide (GO) dispersion according to step (3) of Example 2.

[0050] (4) Dissolve 1 g of sodium tetraborate in 100 mL of distilled water to prepare a sodium tetraborate solution.

[0051] (5) Mix the galactomannan solution, bentonite suspension and graphene oxide solution prepared in steps (1), (2) and (3), and add 0.1wt% sodium tetraborate solution, and stir for 24h , adding the obtained composite solution to a plastic plate, and curing at 90° C. for 8 hours after evaporation and drying to obtain a galactomannan / bentonite / graphene oxide / borate composite film.

[0052] The results showed that in the infrared spectrum of GM / BNT / 0.8%GO / borate composite film ( figure 1 ), when t...

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Abstract

The invention discloses a preparation method of a high-strength flame-retardant galactomannan-based composite membrane. The preparation method comprises the following steps: firstly, preparing a galactomannan solution, a bentonite suspension, a graphene oxide dispersion solution and a borate solution; and mixing and stirring the solutions for 8-72 hours, pouring into a flat plate, evaporating anddrying, and curing at 70-120 DEG C for 4-16 hours to finally obtain the galactomannan / bentonite / graphene oxide / borate composite membrane. The method is simple and feasible, and the galactomannan / bentonite / graphene oxide / borate composite membrane prepared by the method has the characteristics of high strength, high flame retardancy and degradability. Through tests, results show that the tensile strength and toughness of the GM / BNT / 0.8% GO / Bore composite film reach 231.16 MPa and 4.15 MJ / m < 3 > respectively, the limit oxygen index is 46.8%, and the GM / BNT / 0.8% GO / Bore composite film has good practicability.

Description

technical field [0001] The invention relates to the field of using biomass to synthesize composite materials, in particular to a preparation method of a high-strength flame-retardant galactomannan-based composite film. Background technique [0002] The non-renewable and non-degradable properties of petroleum-based products have caused great confusion to the human living environment. For example, in the field of food packaging, aluminum foil, plastic, etc. are widely used in my country to package cooked food. The contents are toxic to the human body, and improper handling after use will cause environmental pollution. To solve this problem, more and more attention has been shifted to the development and utilization of renewable, easily degradable biomass resources to replace products such as petroleum-based chemicals, such as natural plant polysaccharides. [0003] In recent years, with the rise of sugar bioengineering, the application of natural plant polysaccharides as func...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/00C08K3/34C08K3/04C08K3/38C08J5/18
CPCC08J5/18C08J2305/00C08K3/346C08K2003/387C08K3/042
Inventor 勇强陶昱恒黄晨赖晨欢黄曹兴凌喆李鑫徐勇欧阳嘉余世袁
Owner NANJING FORESTRY UNIV
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